7 Most Infamous Killer Couples That Still Frighten Us Today

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There's nothing more frightening than couples coming together over their shared love of murder. These killer duos, who range from thrill killers to sadomasochists, all committed atrocious crimes that are still hard to read about today. But probably the most baffling thing about these pairs is the role women often played in these cases. For some, they were victimized followers who were simply "taking orders." For others, they were willing accomplices who killed for love and devotion to their husbands. Below, seven killer couples and the crimes that made them infamous.

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David Graham and Diane Zamora

These two college sweethearts met at a Navy academy back in 1995, and after getting engaged, it looked as if the couple were about to have a bright future together. Unfortunately, when Diane discovered that David had cheated on her with fellow student Adrianne Jones, she became unhinged. She then told her fiancé to kill Adrianne or else she'd kill herself.

In 1996, David picked up Adrianne in his car while Diane hid in the backseat. Once they drove the victim to a remote area, Diane jumped out and knocked Adrianne over the head with weights. David then finished her off with two gunshots to the face. The two were arrested six months later when Diane confessed the murder to one of her friends. Today, the two are still sitting in prison on life sentences.